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cvtcolor parameter four

asked 2016-10-28 08:00:04 -0500

LBerger gravatar image


I have try something like this using cvtColor to understand parameter 4

Mat img=imread("lena.jpg",IMREAD_COLOR);// I have try an image with alpha channel too
cvtColor(img,dst, CV_BGR2HSV,1);

but results seems equal to cvtColor(img,dst, CV_BGR2HSV);

Is somebody can give me an example of cvtcolor with parameter 4 used?

Thanks in advance

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answered 2016-10-28 20:52:55 -0500

Tetragramm gravatar image

For example: COLOR_YUV2BGR with dcn = 4 would return a BGRA, and dcn = 3 would return BGR

BGR2HSV is fixed at 3, but HSV2BGR can be 3 or 4. The same for Lab2BGR and Luv.

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Yes I found those example too and I think that's something is missing in doc like this

LBerger gravatar imageLBerger ( 2016-10-29 02:48:37 -0500 )edit
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Asked: 2016-10-28 08:00:04 -0500

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Last updated: Oct 28 '16